If I have a German Scatterbug in my game, will it evolve into a Vivillon form other then the one I would normally get?

Question

I got Wonder Traded a German Scatterbug. My region is set to the U.S. What form of Vivillon will the Scatterbug evolve into?

Answer 1

Form is decided based on where the Pokemon was generated, not where it was evolved. This means your German Vivillon will have the Continental Pattern, according to this helpful location finder.

Comments

What about all the countries in that link that are greyed out?

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The 3DS doesn't have location settings for those, so they are irrelevant.
Though, there are some places in the map that are unselectable but still have data assigned to them (https://bulbapedia.bulbagarden.net/wiki/List_of_Nintendo_3DS_country_and_region_settings#Not_selectable).